With only five percent of the ocean explored, Earth's oceans are the final frontier. Yet even the small corners of the sea that man has explored have yielded incredible finds, from sunken treasures, to long lost ships, to creations by Mother Nature herself. Take our quiz to see how much you know about the most amazing things hiding beneath the seas.
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!